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                <h1 class="title-article">python1.输入输出与流程控制</h1>
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                                            <h1><a id="Python_0"></a>Python简介</h1>
<p>python是一种面向对象的脚本语言。学好python，可以做前端，后端，测试，大数据，爬虫，人工智能等。</p>
<h1><a id="Python_2"></a>为什么选择Python</h1>
<p>python简单好用</p>
<h1><a id="Python_4"></a>Python入门</h1>
<h2><a id="_Python_5"></a>一 、安装Python</h2>
<p>推荐安装python3<br>
官网下载地址：<a href="https://www.python.org/downloads" rel="nofollow">https://www.python.org/downloads</a><br>
linux下</p>
<h2><a id="Hello_World_10"></a>编写Hello World</h2>
<p>输入python，如果没有出现下面的实例，检查python的环境变量是否配好</p>
<pre><code class="prism language-python">C<span class="token punctuation">:</span>\Users\<span class="token number">31856</span><span class="token operator">&gt;</span>python
Python <span class="token number">3.7</span><span class="token number">.0</span> <span class="token punctuation">(</span>v3<span class="token punctuation">.</span><span class="token number">7.0</span><span class="token punctuation">:</span><span class="token number">1bf9cc5093</span><span class="token punctuation">,</span> Jun <span class="token number">27</span> <span class="token number">2018</span><span class="token punctuation">,</span> <span class="token number">04</span><span class="token punctuation">:</span><span class="token number">59</span><span class="token punctuation">:</span><span class="token number">51</span><span class="token punctuation">)</span> <span class="token punctuation">[</span>MSC v<span class="token punctuation">.</span><span class="token number">1914</span> <span class="token number">64</span> bit <span class="token punctuation">(</span>AMD64<span class="token punctuation">)</span><span class="token punctuation">]</span> on win32
Type <span class="token string">"help"</span><span class="token punctuation">,</span> <span class="token string">"copyright"</span><span class="token punctuation">,</span> <span class="token string">"credits"</span> <span class="token operator">or</span> <span class="token string">"license"</span> <span class="token keyword">for</span> more information<span class="token punctuation">.</span>
<span class="token operator">&gt;&gt;</span><span class="token operator">&gt;</span> <span class="token keyword">print</span><span class="token punctuation">(</span><span class="token string">'Hello World'</span><span class="token punctuation">)</span>
Hello World
</code></pre>
<p>这是在命令行中进行开发。实际开发中，将代码保存在.py文件中。然后在命令行中执行python xxx.py即可。</p>
<pre><code class="prism language-python"><span class="token comment">#! /user/bin/env python</span>
<span class="token comment"># coding=utf-8</span>
<span class="token keyword">print</span><span class="token punctuation">(</span><span class="token string">'Hello World'</span><span class="token punctuation">)</span>
</code></pre>
<p>第一行代码是说在Linux下执行时，文件由python解释器来执行，windows下没有区别。<br>
第二行代码是告诉解释器编码方式。python2<br>
要加，否则中文会乱码；python3不用。建议加。</p>
<h2><a id="_28"></a>三、变量、输入、输出</h2>
<pre><code class="prism language-python">name <span class="token operator">=</span> <span class="token builtin">input</span><span class="token punctuation">(</span><span class="token string">'username: '</span><span class="token punctuation">)</span>
<span class="token keyword">print</span><span class="token punctuation">(</span>name<span class="token punctuation">)</span>
</code></pre>
<p>input()是输入函数，将用户输入保存到变量name中，然后输出。<br>
变量定义规则：</p>
<ul>
<li>变量名只能是 字母、数字或下划线的任意组合</li>
<li>变量名的第一个字符不能是数字</li>
<li>python关键字不能声明为变量名</li>
</ul>
<h2><a id="_40"></a>四、流程控制和缩进</h2>
<p>python的语法比较简单，采用缩进的方式</p>
<pre><code class="prism language-python"><span class="token comment"># 这是一行注释</span>
<span class="token triple-quoted-string string">"""
这是多行注释
"""</span>
a <span class="token operator">=</span> <span class="token number">1</span>
<span class="token keyword">if</span> a <span class="token operator">&gt;=</span> <span class="token number">1</span><span class="token punctuation">:</span>
	<span class="token keyword">print</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span>
<span class="token keyword">else</span><span class="token punctuation">:</span>
	<span class="token keyword">print</span><span class="token punctuation">(</span><span class="token operator">-</span>a<span class="token punctuation">)</span>
</code></pre>
<h2><a id="_54"></a>五、循环</h2>
<h3><a id="1_55"></a>1.基本格式</h3>
<pre><code class="prism language-python"><span class="token comment"># while 条件:</span>
	<span class="token comment"># 循环体（条件为真，执行）</span>
<span class="token keyword">while</span> <span class="token boolean">True</span><span class="token punctuation">:</span>
	<span class="token keyword">print</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span>
</code></pre>
<p>上面的测试是一个死循环</p>
<h3><a id="2break_64"></a>2.break退出整个循环</h3>
<pre><code class="prism language-python"><span class="token keyword">while</span> <span class="token boolean">True</span>：
	<span class="token keyword">print</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span>
	<span class="token keyword">break</span>
	<span class="token keyword">print</span><span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">)</span>
</code></pre>
<h3><a id="3continue_72"></a>3.continue退出当前循环</h3>
<pre><code class="prism language-python"><span class="token keyword">while</span> <span class="token boolean">True</span>：
	<span class="token keyword">print</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span>
	<span class="token keyword">continue</span>
	<span class="token keyword">print</span><span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">)</span>
</code></pre>
<p>上面的测试程序只会一直输出1</p>
<h2><a id="_81"></a>六、作业</h2>
<h3><a id="1while_1_2_3_4_5_6_____8_9_10_82"></a>1.使用while循环输入 1 2 3 4 5 6     8 9 10</h3>
<pre><code class="prism language-python"><span class="token operator">&gt;&gt;</span><span class="token operator">&gt;</span> <span class="token keyword">for</span> i <span class="token keyword">in</span> <span class="token builtin">range</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span><span class="token number">11</span><span class="token punctuation">)</span><span class="token punctuation">:</span>
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>     <span class="token keyword">if</span> i<span class="token operator">==</span><span class="token number">7</span><span class="token punctuation">:</span>
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>             <span class="token keyword">continue</span>
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>     <span class="token keyword">print</span><span class="token punctuation">(</span>i<span class="token punctuation">)</span>
</code></pre>
<p>range：1要，11不要</p>
<h3><a id="21100_91"></a>2.求1-100的所有数的和</h3>
<pre><code class="prism language-python"><span class="token operator">&gt;&gt;</span><span class="token operator">&gt;</span> <span class="token builtin">sum</span> <span class="token operator">=</span> <span class="token number">0</span>
<span class="token operator">&gt;&gt;</span><span class="token operator">&gt;</span> <span class="token keyword">for</span> i <span class="token keyword">in</span> <span class="token builtin">range</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span><span class="token number">101</span><span class="token punctuation">)</span><span class="token punctuation">:</span>
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>     <span class="token builtin">sum</span> <span class="token operator">+=</span> i
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>
<span class="token operator">&gt;&gt;</span><span class="token operator">&gt;</span> <span class="token keyword">print</span><span class="token punctuation">(</span><span class="token builtin">sum</span><span class="token punctuation">)</span>
<span class="token number">5050</span>
</code></pre>
<h3><a id="3_1100__101"></a>3.输出 1-100 内的所有奇数</h3>
<pre><code class="prism language-python"><span class="token operator">&gt;&gt;</span><span class="token operator">&gt;</span> <span class="token keyword">for</span> i <span class="token keyword">in</span> <span class="token builtin">range</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span><span class="token number">101</span><span class="token punctuation">,</span><span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">:</span>
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>     <span class="token keyword">print</span><span class="token punctuation">(</span>i<span class="token punctuation">)</span>
</code></pre>
<h3><a id="4_1100__107"></a>4.输出 1-100 内的所有偶数</h3>
<pre><code class="prism language-python"><span class="token operator">&gt;&gt;</span><span class="token operator">&gt;</span> <span class="token keyword">for</span> i <span class="token keyword">in</span> <span class="token builtin">range</span><span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">,</span><span class="token number">101</span><span class="token punctuation">,</span><span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">:</span>
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>     <span class="token keyword">print</span><span class="token punctuation">(</span>i<span class="token punctuation">)</span>
</code></pre>
<h3><a id="512345__99_113"></a>5.求1-2+3-4+5 … 99的所有数的和</h3>
<pre><code class="prism language-python"><span class="token operator">&gt;&gt;</span><span class="token operator">&gt;</span> <span class="token builtin">sum</span> <span class="token operator">=</span> <span class="token number">0</span>
<span class="token operator">&gt;&gt;</span><span class="token operator">&gt;</span> <span class="token keyword">for</span> i <span class="token keyword">in</span> <span class="token builtin">range</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span><span class="token number">100</span><span class="token punctuation">)</span><span class="token punctuation">:</span>
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>     <span class="token keyword">if</span> i <span class="token operator">%</span> <span class="token number">2</span> <span class="token operator">==</span> <span class="token number">1</span><span class="token punctuation">:</span>
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>             <span class="token builtin">sum</span> <span class="token operator">+=</span> i
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>     <span class="token keyword">else</span><span class="token punctuation">:</span>
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>             <span class="token builtin">sum</span> <span class="token operator">-=</span> i
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>
<span class="token operator">&gt;&gt;</span><span class="token operator">&gt;</span> <span class="token keyword">print</span><span class="token punctuation">(</span><span class="token builtin">sum</span><span class="token punctuation">)</span>
<span class="token number">50</span>
</code></pre>
<h3><a id="6_126"></a>6.用户登陆（三次机会重试）</h3>
<pre><code class="prism language-python"><span class="token operator">&gt;&gt;</span><span class="token operator">&gt;</span> <span class="token keyword">import</span> getpass
<span class="token operator">&gt;&gt;</span><span class="token operator">&gt;</span> username <span class="token operator">=</span> <span class="token string">'root'</span>
<span class="token operator">&gt;&gt;</span><span class="token operator">&gt;</span> passwd <span class="token operator">=</span> <span class="token string">'root'</span>
<span class="token operator">&gt;&gt;</span><span class="token operator">&gt;</span> flag<span class="token operator">=</span><span class="token number">3</span>
<span class="token operator">&gt;&gt;</span><span class="token operator">&gt;</span> <span class="token keyword">def</span> <span class="token function">login</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">:</span>
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>     user <span class="token operator">=</span> <span class="token builtin">input</span><span class="token punctuation">(</span><span class="token string">'username: '</span><span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>     password <span class="token operator">=</span> getpass<span class="token punctuation">.</span>getpass<span class="token punctuation">(</span><span class="token string">'password: '</span><span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>     <span class="token keyword">return</span> user<span class="token punctuation">,</span>password
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>
<span class="token operator">&gt;&gt;</span><span class="token operator">&gt;</span> <span class="token keyword">while</span> flag<span class="token operator">&gt;</span><span class="token number">0</span><span class="token punctuation">:</span>
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>     user<span class="token punctuation">,</span> password <span class="token operator">=</span> login<span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>     <span class="token keyword">if</span> username <span class="token operator">==</span> user <span class="token operator">and</span> passwd <span class="token operator">==</span> password<span class="token punctuation">:</span>
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>             <span class="token keyword">print</span><span class="token punctuation">(</span><span class="token string">'hello'</span><span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>             <span class="token keyword">break</span>
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>     <span class="token keyword">else</span><span class="token punctuation">:</span>
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>             flag<span class="token operator">-=</span><span class="token number">1</span>
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>             <span class="token keyword">print</span><span class="token punctuation">(</span><span class="token string">'error'</span><span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>
username<span class="token punctuation">:</span> root
password<span class="token punctuation">:</span>
hello
</code></pre>
<p>注意getpass</p>

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                    <a href="https://my.csdn.net/weixin_43213607" class="user-name" target="_blank">weixin_43213607：</a>.如果要卸载安装的应用，我们通过“sudo dpkg -l”查看已经安装的软件，并找到自己的安装的软件名。可以通过“grep”进行过滤。

这个grep如何使用呢？                </p>
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                    <a href="https://my.csdn.net/ye_robert" class="user-name" target="_blank">ye_robert：</a>有什么实际运用例子吗<img src="https://g.csdnimg.cn/static/face/monkey/2.gif" >                </p>
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